Guardian Core, a large Gunwall, that as the name suggests, protects the ship of the unnamed antagonist of the game. When defeated, the player exits the enemy base and follows the Escape Pod containing the enemy.
Pirior the battle, floor and ceiling tiles will rip off and home towards the player. Its top and bottom cannons shoot bouncing spherical energy bullets, and occasionally fires a large laser beam from the middle core.
There is a safespot in this battle - the small gap, directly where the laser is fired - all of the bosses' attacks will miss the player if he waits here. This makes this phase very easy.
|Game Boy Gradius games|
|Ships||Vic Viper • Coreship|
|Nemesis Stages||Volcano • Cell • Moai • Bone • Fortress|
|Gradius: The Interstellar Assault Stages||Remains • Battleship Interior • Asteroid Belt • Planet Surface • Fortress|
|Nemesis Bosses||Volcano • Super Big Core • Zub Rush • Crawler • Zigzag • Striker • Amb • Reckless • Mother Computer Z|
|Gradius: The Interstellar Assault Bosses||Infected Statue • Core Reactor • Crater Core • Fortress Gate • Guardian Core • Escape Ship|
|End bosses and major enemies|
|Major Recurring Foes||Gofer • Bacterian • Dr Venom • Zelos Force (Zeros) • Lars Empire|
|Minor Enemies||Xaerous Brain • O.V.U.M. • Eleos Brain • Mother Computer Z • Guardian Core • Central Server • Genocide Core • Metal Slave • Zelos Barrier • Doom|